You must live in a warm climate - these are the only people who suggest bikes as a replacement for vehicles. Riding a bike in the winter is really difficult. It's not impossible, it's just so much of a challenge that it's not even worth entertaining as an idea - just drive a car with a roof and heater.
Plus, they are not usable in many weather conditions.
Proper cycling and walking infrastructure combined with a reduction of car usage in cities makes cycling an extremely safe activity. In addition the extra health benefits from physical exercise more than offsets any increase in risk from a collision at a societal level.
As for cyling not being usable in many weather conditions - perhaps in extreme winters, but in London there're very few days in the year, if any, that I can't happily ride the 22km round trip to work and back.
Contrast that to the fact that I've never been injured in a car, even though I've been in a few accidents.
As it stands, the current infrastructure is basically hostile at every level.
I've, thankfully, never been injured in a car accident.
I realize this is anecdotal, but there's strong reasons to believe bicycles are dangerous all by themselves. Traveling at high velocities with little protection on only two wheels is a recipe for accidents.
I assume velomobiles or recumbent tricycles would be much safer, if one doesn't mind the looks from passerby.
E-bikes are the way to go. They fill the gap between bike-able distances and those requiring alternate propulsion for many people. And depending on your diet, they're in some cases more environmentally friendly than normal bicycles per distance traveled. That doesn't even matter, since both are an order of magnitude better than the automobile.
It's crazy that we're spending thousands to subsidize electric vehicles and mostly ignoring e-bikes.